Orbit Fit and Astrometric record for 15GD55

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 15GD55    
# Created Thu Dec  9 02:13:13 2021
# Orbit generated from Bernstein formalism
# Fitting     25 observations of     25
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000135   0.027840   0.000004   0.002709   0.026140   0.000000
# Chi-squared of fit:    10.07 DOF:     44 RMS:  0.11
# Min/Max residuals:    -0.22    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.708095E-05  2.771625E-02  1.646007E-06  2.703382E-03  2.617703E-02  1.049401E-03
# Covariance matrix:
  3.0010E-13  2.6172E-14 -4.7755E-15  1.6841E-14  2.4161E-13  3.0122E-12
  2.6172E-14  4.3523E-13 -1.3351E-14  5.2303E-14  2.9058E-13  9.3939E-12
 -4.7755E-15 -1.3351E-14  1.3216E-13 -9.5578E-14 -1.1970E-14 -3.9733E-13
  1.6841E-14  5.2303E-14 -9.5578E-14  1.2737E-13  4.4899E-14  1.5646E-12
  2.4161E-13  2.9058E-13 -1.1970E-14  4.4899E-14  4.0771E-13  8.0507E-12
  3.0122E-12  9.3939E-12 -3.9733E-13  1.5646E-12  8.0507E-12  2.8107E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.657716 -154.234205    0.830848    0.006222   -0.529580  2457071.056568
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:            7.88837 +/-     0.253
Argument of Peri:      356.61882 +/-     0.323
Long of Asc Node:      197.92062 +/-     0.001
Inclination:             5.61319 +/-     0.001
Eccentricity:         0.11642824 +/-    0.0001
Semi-Major Axis:     43.77765129 +/-    0.0036
Time of Perihelion: 2454752.2404 +/-      74.3
Perihelion:          38.68069651 +/-    0.0069
Aphelion:            48.87460606 +/-    0.0073
Period (y)              289.6589 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.24198343 +/-    0.0008
Ecliptic Y          -16.08678792 +/-    0.0004
Ecliptic Z            0.43857882 +/-    0.0000
Ecliptic XDOT         0.00116054 +/-    0.0000
Ecliptic YDOT        -0.00266250 +/-    0.0000
Ecliptic ZDOT         0.00028408 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.74241207 +/-    0.0008
Geocenter to KBO     38.20143305 +/-    0.0009
# Hcoef:  8.91

The following table shows the complete astrometric record for 15GD55. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (15GD55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.55579  13 36 30.891  -09 20 39.72  24.7r 15GD55    568  C~2lVA      
2015 03  18.49249  13 34 58.208  -09 10 33.58  24.6r 15GD55    568  C~2lVA      
2015 03  18.53407  13 34 58.047  -09 10 32.44  24.7r 15GD55    568  C~2lVA      
2015 04  11.47256  13 33 08.563  -08 59 09.12  24.5r 15GD55    568  C~2lVA      
2015 04  12.37938  13 33 04.170  -08 58 41.98  24.2r 15GD55    568  C~2lVA      
2015 04  12.42509  13 33 03.942  -08 58 40.63  24.1r 15GD55    568  C~2lVA      
2015 04  12.46730  13 33 03.758  -08 58 39.45  24.4r 15GD55    568  C~2lVA      
2015 04  18.43790  13 32 34.799  -08 55 41.09  24.7r 15GD55    568  C~2lVA      
2015 04  18.48560  13 32 34.545  -08 55 39.53  24.6r 15GD55    568  C~2lVA      
2015 05  25.38864  13 29 54.195  -08 39 17.00  24.7r 15GD55    568  C~2lVA      
2015 06  21.33827  13 28 47.252  -08 32 25.06  24.7r 15GD55    568  C~2lVA      
2015 06  22.29486  13 28 45.979  -08 32 17.15  25.2r 15GD55    568  C~2lVA      
2015 07  15.27909  13 28 40.832  -08 31 36.22  24.9r 15GD55    568  C~2lVA      
2016 02  04.61431  13 43 02.653  -09 48 42.89  25.3w 15GD55    568  C~2lVA      
2016 04  03.47768  13 40 01.754  -09 29 00.85  24.5w 15GD55    568  C~2lVA      
2016 04  09.45884  13 39 33.220  -09 26 06.10  24.8w 15GD55    568  C~2lVA      
2016 05  02.33963  13 37 43.368  -09 15 00.33  25.7w 15GD55    568  C~2lVA      
2016 05  07.34298  13 37 20.583  -09 12 43.09  25.1w 15GD55    568  C~2lVA      
2016 05  07.36327  13 37 20.489  -09 12 42.28  24.9w 15GD55    568  C~2lVA      
2016 05  29.32744  13 35 54.074  -09 04 04.65  25.4w 15GD55    568  C~2lVA      
2016 06  04.38987  13 35 35.369  -09 02 13.03  25.1w 15GD55    568  C~2lVA      
2016 07  07.31590  13 34 46.784  -08 57 20.90  25.1w 15GD55    568  C~2lVA      
2017 02  27.64150  13 48 36.149  -10 08 59.26        15GD55    568  C~2lVA      
2017 03  29.48748  13 46 44.970  -09 57 18.12        15GD55    568  C~2lVA      
2017 06  25.27303  13 41 06.279  -09 23 51.78  25.5w 15GD55    568  C~2lVA      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

     1   0.0000      0.00    -0.07       0.00    -0.00
     2   0.0792  -1498.63    -0.08      65.82    -0.13
     3   0.0793  -1501.26     0.10      66.02    -0.00
     4   0.1449  -3260.70     0.03     110.96     0.09
     5   0.1474  -3331.22    -0.16     112.45     0.04
     6   0.1475  -3334.86    -0.19     112.47     0.01
     7   0.1476  -3337.83     0.17     112.57     0.07
     8   0.1639  -3802.56     0.16     121.80    -0.12
     9   0.1641  -3806.63    -0.15     121.87    -0.09
    10   0.2651  -6379.92     0.08     165.12    -0.08
    11   0.3389  -7455.91    -0.05     183.28     0.14
    12   0.3415  -7476.41    -0.10     183.69     0.04
    13   0.4044  -7562.58     0.24     193.66     0.05
    14   0.9639   6013.16     0.02     521.36    -0.03
    15   1.1250   3090.45     0.19     662.08     0.09
    16   1.1414   2633.56     0.05     672.69     0.10
    17   1.2041    876.77     0.06     705.37    -0.13
    18   1.2178    512.61    -0.03     711.03    -0.00
    19   1.2178    511.02    -0.14     711.28     0.24
    20   1.2780   -869.37     0.14     729.09    -0.05
    21   1.2945  -1168.08    -0.22     732.34    -0.13
    22   1.3847  -1944.89    -0.00     742.50    -0.07
    23   2.0290  11058.66     0.14    1143.26    -0.04
    24   2.1107   9270.24    -0.20    1214.89     0.01
    25   2.3510   3869.95     0.02    1294.58     0.01

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

15GD55    quality flag:2

Type:       SCATNEAR    7:4EEE  SCATNEAR

axisobj        43.337    43.350    43.324
ecceobj         0.107     0.108     0.107
incobj          5.637     5.637     5.637
qmin           38.051    37.977    37.414
qmax           49.902    49.877    50.470
amean          43.711    43.726    43.724
amin           43.294    43.301    43.250
amax           44.196    44.194    44.220
emean           0.098     0.116     0.120
emin            0.068     0.103     0.094
emax            0.129     0.129     0.142
imean           6.818     6.677     6.773
imin            5.831     5.818     5.355
imax            7.765     7.512     7.742
excite_mean     0.154     0.164     0.168
fracstop        1.000     1.000     1.000
cjmean          3.069     3.066     3.063

libcent 0      -180.0     187.1    -180.0
libamp  0      -180.0     155.9    -180.0
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean       172.6     172.7     176.6
kozaiamp        180.0     180.0     180.0